How to find out the release date of Xiaomi Redmi Note 10S: 5 proven ways

Xiaomi Redmi Note 10S remains a popular choice among users due to its price-performance balance. However, when buying a used device or checking the warranty, it is important to know its exact production date. This depends on the remainder of the warranty period, the relevance of the firmware and even the potential wear of the battery. In this article, we will analyze all available methods from serial number analysis to hidden MIUI menus.

Smartphone manufacturers rarely give a release date directly, but Xiaomi encodes it in the device labeling, knowing where to look, you can avoid cheating on your purchase and correctly assess the condition of the phone, and if you already own a Redmi Note 10S, these methods will help to clarify the age of your gadget for planning maintenance.

1. Checking the date by serial number (IMEI/SN)

The most reliable way is to decrypt the serial number, or IMEI, where the month and year of production are encrypted. The Xiaomi Redmi Note 10S has a serial number (SN) format that starts with letters followed by numbers, such as in the number K680C2A1052004000001:

• 🔢 The 5th and 6th digits (in the example - "05") denote the month (May).
• 🔢 The 7th digit ("2") is the year (2022). If the number "1" is 2021.

To check for IMEI, go to Settings → About Phone → General information or type in the phone application code *#06#. The first 8 digits of IMEI (for example, 86375404) also contain information about the date, but their decryption is more difficult - you will need an online service like IMEI.info.

💡

If the serial number starts with the letters K68, this is confirmed by the Redmi Note 10S model. Other versions of the series (for example, Note 10 Pro) will have a different prefix (for example, K6A).

⚠️ Warning: Some vendors fake serial number stickers on boxes. Always check the number on the device (in settings) with the number on the package.

2.Date on the box and device stickers

The original Xiaomi Redmi Note 10S pack contains several dates:

• 📦 Sticker on the end of the box with a barcode - it is indicated MFD (Manufacturing Date in format YYYY-MM-DD.
• 🏷️ White sticker under the battery (if the phone is disassembled) - there is duplicated production date and serial number.
• 📄 Warranty card (if attached) – the date of sale may differ from the date of production by 1-3 months.

Example of markings on the box:

MFD: 2021.07.15


S/N: K680C2A1072104000001

If the dates on the box and in the serial number of the device do not match, this may indicate:

• 🔄 Repackaging of the phone (for example, after repairs).
• 🛒 Sale of “gray” imports with modified stickers.

3. Verification through the Engineering Menu (CIT)

The CIT (Certificate Information Test) hidden engineering menu allows you to find out the date of production without disassembling the phone.

1. Open the Phone app and enter the code: ##4636##.
2. In the menu that opens, select Phone Information.
3. Scroll down to the Manufacture Date block.

Alternative code for newer versions of MIUI: ##284## (the Packet Loopback menu, where the date is displayed at the bottom). If these codes don't work, try:

adb shell getprop ro.boot.ddr_info

This command will output technical data, including the build date in WEEK/YYYY format (e.g. 25/2021 – Week 25 2021).

Enter code ##4636##| Check the "Phone Information" section | Find the line "Date of production" |Confirm with the data from the serial number-->

⚠️ Note: Not all versions MIUI They support these codes. They support firmware for the global market, MIUI Global access to engineering menus may be restricted.

4. Online services for date verification

If manual methods seem complicated, use official and third-party services:

For example, on mi.com/verify post-injection IMEI You'll get information like:

Model: Redmi Note 10S (mojito)


Activation Date: 2021-08-12




Warranty: Expired (12 months)

Activation and production dates can vary by 1-6 months, which is normal as the devices are stored in warehouses before being sold.

By serial number | Through phone settings |Looking on the box |Use online services |I don't check-->

5. Analysis of firmware version and build date

The MIUI firmware version indirectly indicates the age of the device.

1. Go to Settings → About Phone → MIUI version.
2. Click several times on the line with the version until the Additional Information menu appears.
3. Find the Build Date field, such as 20210715 (July 15, 2021).

Compare the date of assembly with the date of production from the serial number:

• 📅 If the difference is less than 2 months, the original firmware.
• 🔄 If the difference is more than 6 months, the firmware has been updated or re-flashed.

An example of decoding the version of MIUI:

MIUI Global 12.5.3 Stable


Build Date: 20210715 (YYYYMMDD)




Android: 11 RKQ1.201022.002

💡

The firmware build date does not always coincide with the device’s production date, but it helps to assess how old the software version is when buying a used phone.

Physical inspection of the device

Even without technical data, you can approximately determine the age of the Redmi Note 10S by external signs:

• 🔋 Battery: If the phone is discharged in 4-5 hours at an average load, it is likely to be 2+ year-end.
• 📱 Body: Frame and glass scuffs appear after 12-18 months of active use.
• 🔌 Type-C port: backlash or contamination of contacts indicates long-term use.
• 🎧 Speakers and microphone: muffled sound or wheezing is a sign of wear on membranes (typical for devices older than 2 years).

For accurate battery diagnosis, use the AccuBattery application (showing wear in %) or enter the code in the engineering menu:

##4636## → Battery → Level of wear and tear

⚠️ Note: If the seller refuses to provide IMEI Or a serial number to check, which is a reason to question the legality of the device, maybe the phone is wanted or has unofficial firmware.

Frequent errors in checking the release date

Users often encounter inaccurate data due to the following errors:

• 🔍 Confuse the activation date with the production date: Xiaomi’s website displays the date of the first binding to the Mi Account, not the release from the factory.
• 📱 Use it. IMEI dualistic SIM-maps: Redmi Note 10S two slots, and IMEI Each may differ from 1-2 digits.
• 🔄 Do not take into account firmware: after resetting or updating via Fastboot, the date of the software build changes.

To avoid mistakes:

1. Always check data from 2-3 sources (e.g. serial number + box + engineering menu).
2. For used phones, ask the seller for screenshots from Settings → About the phone with the date of assembly.

FAQ: Answers to popular questions